How to make a Telephone Cable – USOC RJ11 RJ45

How to make a Telephone Cable – USOC RJ11 RJ45


Hey, what’s going on, I’m Mercy of DiscountLowVoltage.com and I’m going to show you guys how to make a telephone cable. Now before we get started on crimping, the plugs, testing, cutting, that sort of thing, the most important thing about this cable is you need to know the USOC pinout. Oh, there it is. So this USOC pinout, depending on if you need a one-pair, a two-pair, a three-pair, or four-pair, this pinout is what you want to stick to when you’re making your cable. Now let’s get to it. Okay, so I have some snaps, a tester, a crimp tool, some mod plugs, a RJ11 six-conductor, and an RJ45 plug. We have blue Cat5e cable, and Cat3 cable in white, of course. If you’re using Cat5 for telephone, no problem, no sweat, as long as you’re still using that USOC pinout we talked about earlier.
Okay, so let’s go ahead and start. Let’s cut off a piece of this cable off. There we go. Now you’ll see this pull string here, let’s get rid of that, get out of the way. OK. Now as you can tell, you have an orange pair, you got your blue pair, brown pair, and green pair, depending on what you’re doing, just follow the color-code USOC guide and boom! Now the plug we’re going to do is a six-conductor RJ11 mod plug. So being that that’s a three-pair plug, we’re going to line up the color code to what we need it to be at. Alright, now that we got our pairs straightened out to the color code, we’re going to get rid of this pair. We don’t need this, so go ahead and snip that off here at the bottom. There we go. Now the next step is to, we want to keep these wires as straight as possible when we put it in the plug, but we probably only need, I don’t know, maybe a quarter inch of this, so let’s go ahead and trim this down. There we go.
Now I always like to push a little bit of pressure on my onto these conductors, because it helps to keep them straight. That way they don’t wobble around everywhere. Now let’s get out our mod plug. Now as you can tell, the plug itself, it has this little kind of slot here where the crimp tool is going to come down on it and secure onto the jacket, and the little mod plugs, the gold pins here, they got some teeth. Now they get crimped into the copper conductor inside the plug. Now let’s try to slide this plug on. Now as you’re putting it in, I press up. I press up into the mod plug. It helps keep the wires straight, and then I slide it in there. You kind of get a feel for it. Sometimes it won’t go straight in, so you have to kind of feel it out, move it around a little bit. Make sure it’s in there. And then you want to push the jacket in. There we go, you want to make the jacket get in there too.
Actually, it helps to have it in there as much as possible so this back slot gets crimped down onto it. Another thing you might want to do is you might want to take a look at the conductors in there. It’s hard to tell, but double check that to see if they line up correctly with the USOC pinout and if they do, then we want to go ahead and crimp it. If they don’t, you’re gonna have to pull this out, make sure they’re straight, put it back in there before you crimp it. Now another thing you might want to do, it’s hard to tell, but in the very front of this plug, you can kind of see the conductors pressed up to the mod plug. I always like to press in the cable also, because that helps the copper conductors get terminated and make proper contact with those gold pins once they’re in there. Now let’s crimp this.
Now the tool we got here, it’s a crimp tool, but it has the for the eight-position, the six-position, the four-position cable. We want to put it in the appropriate slot. Let’s pop it in there, and then I always- once again, I like to push in a little bit while it’s in there. Now let’s give the squeeze. Now let’s do the RJ45. Here’s our Cat5 cable, let’s go ahead and cut a piece of this off. Now we’re just gonna do the same thing with the- this cable as we did with the Cat3 four-pair, but that was a, you know, a different connector, the RJ11. This is the RJ45, let’s get to it. There we go. So we got ’em sorta straightened out, you want to definitely double-check these color code at the bottom here, towards your thumbnail. Make sure you got the pinout straightened out, almost trim some of this off. There we go. I want to take a look at it and make sure the pairs are where they need to be.
Looks like we got an orange pair out of place, so we’re gonna go ahead and just kind of move the cable around a little bit. There we go. Keep it straight. Okay. There we go. Now we’re gonna do the same thing with the RJ45 plug like we did with the RJ11. You want to kinda push up into the plug. Push it all the way in. Make sure the front of the plug here is making contact. I mean, it doesn’t have to make perfect contact, but it’s nice to see the pairs all the way in there to where the gold pins can crimp down on them, and don’t forget, you also want your jacket in there past this little prong piece. So crimp tool crimps right into that, boom! Make it a nice, tight, and a proper fit, so that way this jacket doesn’t come out later when you’re pulling the cable out. Now let’s crimp it. Okay. Got our crimp tool with the eight-position slot. Go and slide your plug in there. I push in a little bit into the plug so that way, your plug is, you know, it’s just a little thing that makes me feel a little better. I squeeze it. Boom. There we go. As you can tell, I don’t know if you can tell or not, but the crimp tool, like I said, this little piece right here, it goes in there, squeeze in this little prong onto the jacket, and inside the tool end here, you’re actually getting the gold pins terminated into the conductors. Let’s see if I can get a good shot here for you. Yeah, see? That’s what I’m talking about. Okay, so the last step here, if you’re going to make a lot of these, you might want to buy a continuity tester. This one checks the 10-base T, 56B pinout, the USOC pinout, or the 568B. Now let’s plug the Cat3 patch cable I made into it. Okay. So this was a six-conductor three-pair cable. I have green lights. Let’s check the other side. Alright, we wired it properly.
Alright, so hopefully you learned something today and I helped save you guys some dough for you do-it-yourselfers, and that’s basically it. You can do a Cat3 or a Cat5 cable for telephone cables, but remember, the USOC pinout, that is a universal thing that all the Cat3 cable is wired to. Questions, call us. Number here’s 888-797-3697.

Danny Hutson

69 thoughts on “How to make a Telephone Cable – USOC RJ11 RJ45

  1. That's really interesting, one of the most blatantly informational videos i've seen on youtube, very well done sir.

  2. I am trying to replace telephone handset with a PC headset (head phones and mic) by terminating the telephone handset into a pair of 3.5mm jacks. I am able to get the ringtone into the headphones; but, I am really struggling to get the mic to work. 🙁 Could you help ?

  3. I am trying to set a wall jack rj11 with only 4 holes. this is for connecting my phones. but i am using cat 6 cables with 4 pairs of cable. what should I do about the cable color combination. Help me!

  4. Is it possible to use a Ethernet cable of any type most likely Cat5 cable as a DSL cable as long as i use the proper RJ11 plug for the outlet?

  5. This is very similar to what i'm trying to find out. But in my case i'm trying to find out if the Ethernet cable itself can be used as a DSL line so i can get a longer cable so i'm able to put my modem in a better place. What have you figured out bra?

  6. Hey Mercy, Any idea why some premade RJ11 four conductor phone cable is rolled and some is straight through? Needed a 30 ft POTS extension so I bought a 25ft and 7ft along with a 4 conductor RJ11 coupler. Noticed that the wiring on the 25ft cable was rolled while the 7ft was straight through. Individually both cords worked with the phone, and coupling them together also worked with a phone. So when making my own cable should it be rolled, straight-through, or it doesn't matter?

  7. You can use Cat5e cable for phones as long as it has RJ11 plugs and jacks attached to the ends and is wired correctly. Cable is cable, for the most part. You can use Cat3, Cat5, Cat5e, Cat6, Cat6a, or even Cat7 for phone (and DSL) though it doesn't make sense to use anything higher than Cat5e for phone. You won't see any benefit.

    You cannot go the other way with computer network cable. Cat5/5e shouldn't be used in place of Cat6/6a, and Cat6/6a shouldn't be used in place of Cat7.

  8. Thanks! I just want a realible long cable to replace my current ISP provided DSL cable which is 7 years old now with a new Ethernet cable with RJ11 plugs for Modem input and Wall output

  9. Just make sure to wire the cable the same way – straight through. I'd do Orange, Blue, Green, Green/White, Blue/White, Orange/White. If you have actual RJ11 plugs, just use Green, Green/White. If they are 4 connection, do Blue, Gree, Green/White, Blue/White. This will make it straight through for any type of phone.

    Good luck!

  10. You'll have to make this cable yourself or just wire two RJ11 jacks and use normal phone cable. Running voice over Cat5e is not the intended use, so you won't find cables for it. It's a custom operation only. This may change in the future, as so many people use Cat5e for voice now.

  11. Does the same process work with actual telephone lines? I'm pretty sure this is an Ethernet cable. I was looking for how to make a telephone line – the type with only four wires (green, red, yellow, black).

  12. In your example Instead of trimming away the brown pair, shouldn't you use-
    1 white/brown
    2 white/green
    3 white/ orange
    4 blue/white
    5 white/blue
    6 orange/white
    and trim away the green/white and brown/white?
    Am I overthinking this? If the cables were for my own use the colors wouldnt matter as long as I had continuity in the cable-right? I thought with usoc standard #1 pin is always white/brown, #2 is white/green, and so on. NewB

  13. Thank you for this! I'm in IT so I like to learn different aspects of networking. Would be cool if I could get a hold of a tester someday! Hehe.

  14. good day sir mercy.. I have a problem about my extension telephone  jack1 up to jack 16… if I have caller outside all telephone will ring the 16 telephone extension.. pls.. help me for this..i looking forward.. god bless

  15. Cool Channel , bro. 
    Good to see someone with a passion for their specialized trade. 
    And thanks for the cool videos 🙂 
    Subscribed 🙂 

  16. Dear Mercy,
    I was looking for a solution i want to connet a microphone and speaker to my basic telephone box which do not have any audio or microphone out pin..

    how can i do that .. do you have any idea.. about the same.

  17. I Couldn't see the colour clearly, could you spell out  the wires' color for RJ11 from top to bottom and RJ45 from top to bottom as well

  18. Hello. I am trying to fix a RJ-11 for my telephone line. It previously had a 4c but I bought a 6P6C. Can that still be used? Is there an order that the wires have to be in? I cant get it to work.

  19. Awesome, Thank you so much for this video .
    Very proffessional.
    Cheers Mercy. Best Video for its purpose on Youtube.

  20. Well done. Now, if I can figure out how to run phone/dsl lines through my house from the jct box outside I will be in good shape. 🙂

  21. Do you need just 3 wires connection or there is fourth connection as well ? In the film you didnt have the fourth wire light turned on ?

  22. Thanks Mercy! I pulled the wiring out of my telephone plug by accident and was able to fix for $20, buying a plug crimper and some RJ11 plugs.  It was so easy to figure out what wires to put where with your grid.  You ROCK!!  P.S. I was so proud, I called my husband and he tried to tell me I must have crossed the wires because everything I said was backwards. I fell for it…lol

  23. say Mercy; say I built this type of cable and used it to connect and rj-45 jack to my routers rj-11 port…. would the router acquire the connection and provide me with internet, or would the router be unable to make use of it?

  24. Thanks Mercy, 

    I am an amateur DIY networker. Meaning I am learning and doing. I have a scenario I need your help. 

    I have a Cat5e running from my attic to my study. 3 pairs has been used up by home security for the alarm in attic as well as study and they left me with one pair Green and White Green Which terminates in my study. I don't want to mess with security company's wiring so I am seeking help with wiring for data using 1 pair here. So the next thing I did is run another cat5e where that 1 pair cat5e terminated (hoping one day i might get all 4 pairs back), to my closet downstairs where my network junction box is connected to the switch that distributes data and internet to entire home.

    I have heard and read somewhere that it is possible to have a Cat5e (from junction box) to RJ11 (attic to study) to Cat5e (ethernet port in study) again but I do not know the wiring scheme. If you could help me if this is possible i would greatly appreciate it. I have LAN everywhere in my house but here because of this issue. Please let me know if this will even work.

  25. How can i manamge to connect two router from two different providers.
    I would like to know if it is possible to transform a cable from R45 port in router A to a RJ11/ADSL for router B. so that the internet signal from Router A goes into router B by simulating an ADSL internet? regards.

  26. Went through about 25 Rj11 on my MagicJack before I decided to sit back , take a breath and figure out what the hell I was doing wrong….lol Watched this video, cut my wires down to just 2 and POW! Now my phone works….lol Only took me 3 hours to break down and get help….lol Thanks dude!!

  27. Making a USOC cable is better than the standard 578-B because its connection is more direct and crossed with the correct cables in tests the network speed is improved and the interferences do not cause much problem of connection of data in the network

  28. Thank you very much for this.
    A thunderstorm managed to fry my 20yr old phone wire (fortunately it went through a surge protector so it didn't fry my phone (this time). I plan to replace it with Southwire 24/4 indoor/outdoor (which will run under the floor of a house on stilts). I'm trying to figure out which type of RJ11 connector to use for that application to get the best results. I see there's RJ11 6P6C, 6P4C & 6P2C. I'm guessing it wouldn't be the 2C. I will run the line directly from the box to a surge protector and then to two phones (1 is a basic corded phone that will work if power is out & other is a panasonic multi-handset/intercom phone).
    I'm also wondering if there are any additional in-line surge protectors you would recommend for both ends of the line to protect the connectors from frying (power surges & outages are frequent in my area).
    What was the tool you used for checking to see if the connectors were wired correctly?

  29. Wait. What about colors? Are they supposed to line up like you have them or does it just not matter? I guess thus is for experienced ppl only?

  30. Hi ! Thank you for sharing your video. I'm not sure what's the wire color sequence is on your video (not clear on my end sorry!) for wiring a telephone using cat5e cable. The old connector broke off and it only had 4 terminals . Can you please tell me if it matters if I'll use a connector with 8 terminals. Thank you.

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